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Hazelnut and its by-products: A comprehensive review of nutrition, phytochemical profile, extraction, bioactivities and applications. Food Chem 2023; 413:135576. [PMID: 36745946 DOI: 10.1016/j.foodchem.2023.135576] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 01/19/2023] [Accepted: 01/24/2023] [Indexed: 01/26/2023]
Abstract
As output of hazelnut increases worldwide, so does the amount of by-products, leading to huge waste and environmental stress. This paper focuses on the varieties of hazelnut that have been studied more in the past two decades, and summarizes the research status of hazelnut and its by-products from the aspects of nutritional value, phytochemicals, extraction methods, biological functions and applications. Hazelnut and its by-products are rich in a variety of bioactive constituents, mainly polyphenols, which have antioxidant, antibacterial and prebiotic effects. Moreover, hazelnut shells, husks, and leaves contain taxanes such as paclitaxel, which can inhibit the proliferation of cancer cells. They are potentially good natural sources of paclitaxel compared to the slower growing yew. Therefore, it is essential to further integrate the extraction techniques and health-promoting properties of these nutrients and bioactive substances to expand their application and enhance their value.
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Ceylan FD, Adrar N, Bolling BW, Capanoglu E. Valorisation of hazelnut by-products: current applications and future potential. Biotechnol Genet Eng Rev 2022:1-36. [PMID: 36576098 DOI: 10.1080/02648725.2022.2160920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 12/16/2022] [Indexed: 12/29/2022]
Abstract
Hazelnut is one of the most widely consumed nuts around the world. Considering the nutritional value of hazelnuts, a wide range of hazelnut-based food products are available in the market such as oil, chocolate, confectionery, etc. Nevertheless, the processing of hazelnuts generates a large number of by-products and waste. The most valuable by-products of the hazelnut industry are shell, skin, and meal. These by-products are rich in bioactive compounds, protein, dietary fibre, mono- and polyunsaturated fatty acids, vitamins, minerals, phytosterols, and squalene. The current utilisation of hazelnut by-products is mostly limited to animal feed supplementation of hazelnut meal and skin and use as a low-value heat source for the shells. However, disposing of these by-products or using them as a low-value heat source or animal feed supplementation results in significant waste of a natural resource rich in nutritional components. Consequently, valorising hazelnut by-products as bioactive ingredients in diverse fields such as food, pharmaceuticals and cosmetics has stimulated interest among scientists, producers, and consumers. This review provides an overview of current scientific knowledge about the main and most valuable hazelnut by-products and their actual valorisation, with a focus on their chemical composition to inspire new applications of these valuable resources and fully exploit their potential.
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Affiliation(s)
- Fatma Duygu Ceylan
- Faculty of Chemical & Metallurgical Engineering, Food Engineering Department, Istanbul Technical University, Maslak, Turkey
| | - Nabil Adrar
- Faculty of Chemical & Metallurgical Engineering, Food Engineering Department, Istanbul Technical University, Maslak, Turkey
| | - Bradley W Bolling
- Department of Food Science, University of Wisconsin-Madison, Madison, WI, USA
| | - Esra Capanoglu
- Faculty of Chemical & Metallurgical Engineering, Food Engineering Department, Istanbul Technical University, Maslak, Turkey
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3
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Cellulose Isolation from Tomato Pomace Pretreated by High-Pressure Homogenization. Foods 2022; 11:foods11030266. [PMID: 35159418 PMCID: PMC8833915 DOI: 10.3390/foods11030266] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/13/2022] [Accepted: 01/15/2022] [Indexed: 02/04/2023] Open
Abstract
This work proposes a biorefinery approach for the utilization of agri-food residues, such as tomato pomace (TP), through combining chemical hydrolysis with high-pressure homogenization (HPH), aiming to achieve the isolation of cellulose with tailored morphological properties from underused lignocellulose feedstocks, along with the valorization of the value-added compounds contained in the biomass. Cellulose was isolated from TP using sequential chemical hydrolysis in combination with mechanical pretreatment through HPH. The chemical and structural features of cellulose isolated from TP pretreated by HPH were compared with cellulose isolated from untreated TP through light scattering for particle size distribution, optical and scanning electron microscopy, and Fourier-transform infrared spectroscopy (FT-IR) analysis. HPH pretreatment (80 MPa, 10 passes) not only promoted a slight increase in the yield of cellulose extraction (+9%) but contributed to directly obtaining defibrillated cellulose particles, characterized by smaller irregular domains containing elongated needle-like fibers. Moreover, the selected mild chemical process produced side streams rich in bioactive molecules, evaluated in terms of total phenols and reducing activity. The liquors recovered from acid hydrolysis of TP exhibited a higher biological activity than those obtained through a conventional extraction (80% v/v acetone, 25 °C, 24 h at 180 rpm).
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Ali SS, Al-Tohamy R, Xie R, El-Sheekh MM, Sun J. Construction of a new lipase- and xylanase-producing oleaginous yeast consortium capable of reactive azo dye degradation and detoxification. BIORESOURCE TECHNOLOGY 2020; 313:123631. [PMID: 32540694 DOI: 10.1016/j.biortech.2020.123631] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 05/30/2020] [Accepted: 06/02/2020] [Indexed: 05/07/2023]
Abstract
A new oleaginous yeast consortium Y-BC-SH which stands for molecularly identified species Yarrowia sp., Barnettozyma californica and Sterigmatomyces halophilus was successfully constructed in this study. This multipurpose oleaginous yeast consortium was developed based on its higher ability to accumulate large amounts of lipids in the form of triacylglycerol, grow on xylose, produce lipase and xylanase and it could rapidly decolorize and degrade commonly-used textile reactive azo dyes. The specific enzyme activities of lipase, xylanase, xylan esterase, β-xylosidase, CMCase, β-glucosidase and cellobiohydrolase produced by Y-BC-SH were significantly higher than that of individual strains. As chemical oxygen demand reduction had occurred in the dye mixture solutions, it was evidence of their color removal and mineralization by Y-BC-SH. The significant induction of oxidoreductive enzymes by Y-BC-SH was probably due to the coordinated metabolic interactions of the individual strains. Phytotoxicity assay confirmed that metabolites generated after dye degradation by Y-BC-SH are non-toxic.
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Affiliation(s)
- Sameh Samir Ali
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China; Botany Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
| | - Rania Al-Tohamy
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Rongrong Xie
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
| | | | - Jianzhong Sun
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.
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Steam explosion (SE) and instant controlled pressure drop (DIC) as thermo-hydro-mechanical pretreatment methods for bioethanol production. Bioprocess Biosyst Eng 2020; 43:945-957. [PMID: 32025810 DOI: 10.1007/s00449-020-02297-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 12/09/2019] [Indexed: 02/06/2023]
Abstract
Lignocellulosic biomass can be considered as one of the largest sources for the production of renewable biofuels (bioethanol). It involves an enzymatic treatment capable of ensuring the depolymerization of cellulose into fermentable sugars, followed by the production of ethanol by appropriate bacteriological fermentation. Proper destruction of the compact natural structure of the biomass would allow an interesting intensification of the operation. Among the most prominent technical approaches, the steam explosion (SE) is the most famous. However, this high pressure-high temperature process implies too high energy consumption while leading to the generation of many non-fermentable molecules. In recent years, many studies have proposed the use of the Instant Controlled Pressure-Drop (DIC) texturing pretreatment as an effective alternative to SE for ethanol production. Therefore, in this manuscript, we propose to compare and discuss the fundamental principles and experimental results of these two operations, as presented in the relevant literature.
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Naeimi B, Foroutan R, Barmak A, Mohebbi G. Producing ethanol from D-xylose sugar through Candida albicans: the impact of temperature, sugar content and pH. GAZZETTA MEDICA ITALIANA ARCHIVIO PER LE SCIENZE MEDICHE 2019. [DOI: 10.23736/s0393-3660.18.03877-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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7
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Valorization of peanut shells: Manufacture of bioactive oligosaccharides. Carbohydr Polym 2017; 183:21-28. [PMID: 29352877 DOI: 10.1016/j.carbpol.2017.11.009] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 10/26/2017] [Accepted: 11/01/2017] [Indexed: 01/29/2023]
Abstract
Peanut shells were subjected to non-isothermal aqueous treatments to cause the partial breakdown of hemicelluloses into soluble oligosaccharides and lignin-derived compounds with high antioxidant activity. The effects of temperature on the chemical composition of the substrate and soluble reaction products were assessed. Under selected conditions (210°C, severity=4.09), the overall amount of poly- and oligo- saccharides present in the liquid phase reached 9.8g/L. This solution was refined by consecutive stages of discontinuous diafiltration, yielding a refined product containing about 72.4wt% of oligomers at a global yield of 8.5kg/100kg oven-dry PS. The purified products were characterized by HPLC, MALDI-TOF-MS and FTIR, confirming the major reaction products were saccharides made up of xylose with degrees of polymerization up to 17, substituted with acetyl and methylglucuronosyl groups, for which a number of pharmaceutical and food applications have been proposed. Solubilization of hemicelluloses in the treatments resulted in the production of solids enriched in cellulose and lignin suitable for further applications.
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Clostridium species strain BOH3 tolerates and transforms inhibitors from horticulture waste hydrolysates. Appl Microbiol Biotechnol 2017; 101:6289-6297. [DOI: 10.1007/s00253-017-8368-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 05/19/2017] [Accepted: 05/24/2017] [Indexed: 12/11/2022]
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9
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Vadivel V, Moncalvo A, Dordoni R, Spigno G. Effects of an acid/alkaline treatment on the release of antioxidants and cellulose from different agro-food wastes. WASTE MANAGEMENT (NEW YORK, N.Y.) 2017; 64:305-314. [PMID: 28318962 DOI: 10.1016/j.wasman.2017.03.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 02/04/2017] [Accepted: 03/06/2017] [Indexed: 06/06/2023]
Abstract
The present investigation was aimed to evaluate the release of both antioxidants and cellulosic fibre from different agro-food wastes. Cost-effective and easily available agro-food residues (brewers' spent grains, hazelnut shells, orange peels and wheat straw) were selected and submitted to a double-step acid/alkaline fractionation process. The obtained acid and alkaline liquors were analysed for total phenols content and antioxidant capacity. The final fibre residue was analysed for the cellulose, lignin and hemicellulose content. The total phenols content and antioxidant capacity of the acid liquors were higher than the alkaline hydrolysates. Orange peels and wheat straw gave, respectively, the highest (19.70±0.68mg/gdm) and the lowest (4.70±0.29mg/gdm) total phenols release. Correlation between antioxidant capacity of the liquors and their origin depended on the analytical assay used to evaluate it. All the acid liquors were also rich in sugar degradation products (mainly furfural). HPLC analysis revealed that the most abundant phenolic compound in the acid liquors was vanillin for brewers' spent grains, hazelnut shells and wheat straw, and p-hydroxybenzoic acid for orange peels. Wheat straw served as the best raw material for cellulose isolation, providing a final residue with a high cellulose content (84%) which corresponded to 45% of the original cellulose. The applied process removed more than 90% of the hemicellulose fraction in all the samples, while delignification degree ranged from 67% (in hazelnut shells), to 93% (in brewers' spent grains). It was not possible to select a unique raw material for the release of highest levels of both total phenols and cellulose.
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Affiliation(s)
- Vellingiri Vadivel
- Centre for Advanced Research in Indian System of Medicine (CARISM), SASTRA University, Thanjavur, Tamil Nadu, India
| | - Alessandro Moncalvo
- Institute of Oenology and Agro-Food Engineering, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, 29122 Piacenza, Italy
| | - Roberta Dordoni
- Institute of Oenology and Agro-Food Engineering, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, 29122 Piacenza, Italy
| | - Giorgia Spigno
- Institute of Oenology and Agro-Food Engineering, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, 29122 Piacenza, Italy.
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10
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Ma K, He M, You H, Pan L, Hu G, Cui Y, Maeda T. Enhanced fuel ethanol production from rice straw hydrolysate by an inhibitor-tolerant mutant strain of Scheffersomyces stipitis. RSC Adv 2017. [DOI: 10.1039/c7ra04049k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel process for bioethanol production from lignocellulosic biomass using an inhibitor-tolerant mutant strain of Scheffersomyces stipitis and cell-recycling continuous fermentation.
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Affiliation(s)
- Kedong Ma
- College of Environmental and Chemical Engineering
- Dalian University
- Dalian 116622
- PR China
- Key Laboratory of Development and Application of Rural Renewable Energy
| | - Mingxiong He
- Key Laboratory of Development and Application of Rural Renewable Energy
- Ministry of Agriculture
- Biomass Energy Technology Research Centre
- Biogas Institute of Ministry of Agriculture
- Chengdu 610041
| | - Huiyan You
- College of Environmental and Chemical Engineering
- Dalian University
- Dalian 116622
- PR China
| | - Liwei Pan
- College of Environmental and Chemical Engineering
- Dalian University
- Dalian 116622
- PR China
| | - Guoquan Hu
- Key Laboratory of Development and Application of Rural Renewable Energy
- Ministry of Agriculture
- Biomass Energy Technology Research Centre
- Biogas Institute of Ministry of Agriculture
- Chengdu 610041
| | - Yubo Cui
- Department of Environmental Science and Technology
- Dalian Nationalities University
- Dalian 116600
- PR China
| | - Toshinari Maeda
- Department of Biological Functions Engineering
- Graduate School of Life Science and Systems Engineering
- Kyushu Institute of Technology
- Kitakyushu 808-0196
- Japan
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Uzuner S, Cekmecelioglu D. Hydrolysis of Hazelnut Shells as a Carbon Source for Bioprocessing Applications and Fermentation. INTERNATIONAL JOURNAL OF FOOD ENGINEERING 2014. [DOI: 10.1515/ijfe-2014-0158] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Hazelnut shells are generated in large amounts from hazelnut processing. Currently, it is used as fuel. However, reuse in bioprocessing can release remarkable content of sugars, which can be used for production of additives such as enzymes widely used in the food industry. Thus, the present study was undertaken to determine the effect of single and combined chemical and enzymatic hydrolysis on the production of fermentable sugars from hazelnut shells. Batch hydrolysis was carried out under various conditions to select optimal conditions. The results revealed that an optimal sugar concentration of about 19.2 g/l was achieved after 3.42% (w/w) dilute acid pretreatment conducted at 130°C for 31.7 min and enzymatic load of 200 U/g for 24 h. The overall sugar yield was calculated as 72.4% (g reducing sugar/g total carbohydrate). Therefore, hazelnut shells can be considered a suitable feedstock to compete with synthetic sugars used in fermentations.
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12
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Singh J, Suhag M, Dhaka A. Augmented digestion of lignocellulose by steam explosion, acid and alkaline pretreatment methods: a review. Carbohydr Polym 2014; 117:624-631. [PMID: 25498680 DOI: 10.1016/j.carbpol.2014.10.012] [Citation(s) in RCA: 167] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 10/02/2014] [Accepted: 10/05/2014] [Indexed: 10/24/2022]
Abstract
Lignocellulosic materials can be explored as one of the sustainable substrates for bioethanol production through microbial intervention as they are abundant, cheap and renewable. But at the same time, their recalcitrant structure makes the conversion process more cumbersome owing to their chemical composition which adversely affects the efficiency of bioethanol production. Therefore, the technical approaches to overcome recalcitrance of biomass feedstock has been developed to remove the barriers with the help of pretreatment methods which make cellulose more accessible to the hydrolytic enzymes, secreted by the microorganisms, for its conversion to glucose. Pretreatment of lignocellulosic biomass in cost effective manner is a major challenge to bioethanol technology research and development. Hence, in this review, we have discussed various aspects of three commonly used pretreatment methods, viz., steam explosion, acid and alkaline, applied on various lignocellulosic biomasses to augment their digestibility alongwith the challenges associated with their processing.
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Affiliation(s)
- Joginder Singh
- Laboratory of Environmental Biotechnology, Department of Botany, A. I. Jat H. M. College, Rohtak 124001, Haryana, India.
| | - Meenakshi Suhag
- Institute of Environmental Studies, Kurukshetra University, Kurukshetra 136119, Haryana, India.
| | - Anil Dhaka
- PNRS Government College, Rohtak 124001, Haryana, India.
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Negro MJ, Alvarez C, Ballesteros I, Romero I, Ballesteros M, Castro E, Manzanares P, Moya M, Oliva JM. Ethanol production from glucose and xylose obtained from steam exploded water-extracted olive tree pruning using phosphoric acid as catalyst. BIORESOURCE TECHNOLOGY 2014; 153:101-107. [PMID: 24345569 DOI: 10.1016/j.biortech.2013.11.079] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 11/26/2013] [Accepted: 11/28/2013] [Indexed: 06/03/2023]
Abstract
In this work, the effect of phosphoric acid (1% w/w) in steam explosion pretreatment of water extracted olive tree pruning at 175°C and 195°C was evaluated. The objective is to produce ethanol from all sugars (mainly glucose and xylose) contained in the pretreated material. The water insoluble fraction obtained after pretreatment was used as substrate in a simultaneous saccharification and fermentation (SSF) process by a commercial strain of Saccharomyces cerevisiae. The liquid fraction, containing mainly xylose, was detoxified by alkali and ion-exchange resin and then fermented by the xylose fermenting yeast Scheffersomyces stipitis. Ethanol yields reached in a SSF process were close to 80% when using 15% (w/w) substrate consistency and about 70% of theoretical when using prehydrolysates detoxified by ion-exchange resins. Considering sugars recovery and ethanol yields about 160g of ethanol from kg of water extracted olive tree pruning could be obtained.
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Affiliation(s)
- M J Negro
- Biofuels Unit, DER-CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain
| | - C Alvarez
- Biofuels Unit, DER-CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain
| | - I Ballesteros
- Biofuels Unit, DER-CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain
| | - I Romero
- Department of Chemical, Environmental and Materials Engineering, University of Jaen, Campus Las Lagunillas, 23071 Jaen, Spain
| | - M Ballesteros
- Biofuels Unit, DER-CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain
| | - E Castro
- Department of Chemical, Environmental and Materials Engineering, University of Jaen, Campus Las Lagunillas, 23071 Jaen, Spain
| | - P Manzanares
- Biofuels Unit, DER-CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain
| | - M Moya
- Department of Chemical, Environmental and Materials Engineering, University of Jaen, Campus Las Lagunillas, 23071 Jaen, Spain
| | - J M Oliva
- Biofuels Unit, DER-CIEMAT, Avda. Complutense 40, 28040 Madrid, Spain.
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Bellido C, González-Benito G, Coca M, Lucas S, García-Cubero MT. Influence of aeration on bioethanol production from ozonized wheat straw hydrolysates using Pichia stipitis. BIORESOURCE TECHNOLOGY 2013; 133:51-58. [PMID: 23422301 DOI: 10.1016/j.biortech.2013.01.104] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Revised: 01/15/2013] [Accepted: 01/17/2013] [Indexed: 06/01/2023]
Abstract
The influence of aeration on ethanol production by Pichia stipitis was studied in wheat straw hydrolysates subjected to ozone pretreatment for the first time. In a first stage, different aeration rates ranging from 0.03 to 0.50 L air/min, which corresponds to a volumetric oxygen transfer coefficient from 1.1 to 9.6 h(-1), were applied to model glucose/xylose substrates. The most promising value was found to be 3.3 h(-1) (0.1 L air/min) leading to better xylose utilization, an ethanol yield of 0.40 g ethanol/g sugars and complete depletion of sugars at 72 h. In a second stage, the effect of aeration was analyzed in ozonized wheat straw hydrolysates. Sugars were completely depleted at 96 h and ethanol yield reached a value of 0.41 g ethanol/g sugars. The addition of controlled oxygen (K(L)a=3.8 h(-1)) enhances the efficiency of the process causing an increase of 29.1% in ethanol production and a considerable reduction of 42.9% in fermentation time as compared to non-aerated hydrolysates.
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Affiliation(s)
- Carolina Bellido
- Department of Chemical Engineering and Environmental Technology, University of Valladolid, Valladolid, Spain
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15
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Silva JPA, Carneiro LM, Roberto IC. Treatment of rice straw hemicellulosic hydrolysates with advanced oxidative processes: a new and promising detoxification method to improve the bioconversion process. BIOTECHNOLOGY FOR BIOFUELS 2013; 6:23. [PMID: 23414668 PMCID: PMC3618257 DOI: 10.1186/1754-6834-6-23] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2012] [Accepted: 01/31/2013] [Indexed: 05/16/2023]
Abstract
BACKGROUND The use of lignocellulosic constituents in biotechnological processes requires a selective separation of the main fractions (cellulose, hemicellulose and lignin). During diluted acid hydrolysis for hemicellulose extraction, several toxic compounds are formed by the degradation of sugars and lignin, which have ability to inhibit microbial metabolism. Thus, the use of a detoxification step represents an important aspect to be considered for the improvement of fermentation processes from hydrolysates. In this paper, we evaluated the application of Advanced Oxidative Processes (AOPs) for the detoxification of rice straw hemicellulosic hydrolysate with the goal of improving ethanol bioproduction by Pichia stipitis yeast. Aiming to reduce the toxicity of the hemicellulosic hydrolysate, different treatment conditions were analyzed. The treatments were carried out according to a Taguchi L16 orthogonal array to evaluate the influence of Fe+2, H2O2, UV, O3 and pH on the concentration of aromatic compounds and the fermentative process. RESULTS The results showed that the AOPs were able to remove aromatic compounds (furan and phenolic compounds derived from lignin) without affecting the sugar concentration in the hydrolysate. Ozonation in alkaline medium (pH 8) in the presence of H2O2 (treatment A3) or UV radiation (treatment A5) were the most effective for hydrolysate detoxification and had a positive effect on increasing the yeast fermentability of rice straw hemicellulose hydrolysate. Under these conditions, the higher removal of total phenols (above 40%), low molecular weight phenolic compounds (above 95%) and furans (above 52%) were observed. In addition, the ethanol volumetric productivity by P. stipitis was increased in approximately twice in relation the untreated hydrolysate. CONCLUSION These results demonstrate that AOPs are a promising methods to reduce toxicity and improve the fermentability of lignocellulosic hydrolysates.
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Affiliation(s)
- João Paulo Alves Silva
- Deparatmento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo, Estrada Municipal do Campinho s/n, Cep, 12602-810, Lorena, SP, Brazil
| | - Livia Melo Carneiro
- Deparatmento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo, Estrada Municipal do Campinho s/n, Cep, 12602-810, Lorena, SP, Brazil
| | - Inês Conceição Roberto
- Deparatmento de Biotecnologia, Escola de Engenharia de Lorena, Universidade de São Paulo, Estrada Municipal do Campinho s/n, Cep, 12602-810, Lorena, SP, Brazil
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16
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Çöpür Y, Tozluoglu A, Özkan M. Evaluating pretreatment techniques for converting hazelnut husks to bioethanol. BIORESOURCE TECHNOLOGY 2013; 129:182-190. [PMID: 23246759 DOI: 10.1016/j.biortech.2012.11.058] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Revised: 11/09/2012] [Accepted: 11/10/2012] [Indexed: 06/01/2023]
Abstract
This study examined the suitability of husk waste for bioethanol production and compared pretreatment techniques with regard to their efficiencies. Results showed that 4% NaBH4 (90 min) delignified the highest amount of lignin (49.1%) from the structure. The highest xylan solubility (77.9%) was observed when samples were treated with 4% NaOH for 90 min. Pretreatment with NaOH and NaBH4, compared to H2O2 and H2SO4, resulted in selective delignification. The highest glucan to glucose conversion (74.4%) and the highest ethanol yield (52.6 g/kg husks) were observed for samples treated with 2% NaOH for 90 min.
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Affiliation(s)
- Yalçın Çöpür
- Düzce Üniversitesi Orman Fakültesi, Orman Endüstri Mühendisliği Bölümü, Konuralp Yerleşkesi, 81000 Düzce, Turkey.
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Optimized Fed-Batch Fermentation of Scheffersomyces stipitis for Efficient Production of Ethanol from Hexoses and Pentoses. Appl Biochem Biotechnol 2013; 169:1895-909. [DOI: 10.1007/s12010-013-0100-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Accepted: 01/10/2013] [Indexed: 12/21/2022]
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18
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Characterization of extracellular lignocellulolytic enzymes of Coniochaeta sp. during corn stover bioconversion. Process Biochem 2012. [DOI: 10.1016/j.procbio.2012.10.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Bellido C, Bolado S, Coca M, Lucas S, González-Benito G, García-Cubero MT. Effect of inhibitors formed during wheat straw pretreatment on ethanol fermentation by Pichia stipitis. BIORESOURCE TECHNOLOGY 2011; 102:10868-74. [PMID: 21983414 DOI: 10.1016/j.biortech.2011.08.128] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Revised: 08/29/2011] [Accepted: 08/30/2011] [Indexed: 05/04/2023]
Abstract
The inhibitory effect of the main inhibitors (acetic acid, furfural and 5-hydroxymethylfurfural) formed during steam explosion of wheat straw was studied through ethanol fermentations of model substrates and hydrolysates from wheat straw by Pichia stipitis. Experimental results showed that an increase in acetic acid concentration led to a reduction in ethanol productivity and complete inhibition was observed at 3.5 g/L. Furfural produced a delay on sugar consumption rates with increasing concentration and HMF did not exert a significant effect. Fermentations of the whole slurry from steam exploded wheat straw were completely inhibited by a synergistic effect due to the presence of 1.5 g/L acetic acid, 0.15 g/L furfural and 0.05 g/L HMF together with solid fraction. When using only the solid fraction from steam explosion, hydrolysates presented 0.5 g/L of acetic acid, whose fermentations have submitted promising results, providing an ethanol yield of 0.45 g ethanol/g sugars and the final ethanol concentration reached was 12.2 g/L (10.9 g ethanol/100 g DM).
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Affiliation(s)
- Carolina Bellido
- Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
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Corynebacterium glutamicum as a potent biocatalyst for the bioconversion of pentose sugars to value-added products. Appl Microbiol Biotechnol 2011; 93:95-106. [DOI: 10.1007/s00253-011-3686-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Revised: 09/22/2011] [Accepted: 10/28/2011] [Indexed: 11/25/2022]
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Koivula E, Kallioinen M, Preis S, Testova L, Sixta H, Mänttäri M. Evaluation of various pretreatment methods to manage fouling in ultrafiltration of wood hydrolysates. Sep Purif Technol 2011. [DOI: 10.1016/j.seppur.2011.09.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Overcoming inhibitors in a hemicellulosic hydrolysate: improving fermentability by feedstock detoxification and adaptation of Pichia stipitis. J Ind Microbiol Biotechnol 2011; 38:1939-45. [DOI: 10.1007/s10295-011-0981-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Accepted: 05/02/2011] [Indexed: 10/18/2022]
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Yu Y, Feng Y, Xu C, Liu J, Li D. Onsite bio-detoxification of steam-exploded corn stover for cellulosic ethanol production. BIORESOURCE TECHNOLOGY 2011; 102:5123-5128. [PMID: 21334878 DOI: 10.1016/j.biortech.2011.01.067] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2010] [Revised: 01/19/2011] [Accepted: 01/20/2011] [Indexed: 05/27/2023]
Abstract
In the process of ethanol production from steam-exploded corn stover (SECS), a cellulose-degradation strain of Aspergillus nidulans (FLZ10) was investigated whether it could remove the inhibitors released from steam exploded pretreatment , and thereby be used for biological detoxification on Saccharomycescerevisiae. The results showed that FLZ10 removed 75.2% formic acid, 53.6% acetic acid, and 100% hydroxymethyl furfural (5-HMF) and furfural from the hydrolysate washed from SECS after 72h cultivation. A cellulase activity of 0.49 IU/ml was simultaneously produced while the biological detoxification occurred. An ethanol yield of 0.45 g/g on glucose was obtained in the hydrolysate biodetoxified by FLZ10. The glucose consumption rate of FLZ10 was much lower than that of S. cerevisiae, thereby it had little competition with S. cerevisiae on glucose consumption. Based on SECS to ethanol mass balance analysis, with the onsite bio-detoxification, fermentation using S. cerevisiae effectively converted monomeric glucose with 94.4% ethanol yield.
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Affiliation(s)
- Yanling Yu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin 150090, China
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